Plurals are quite easy to understand. In English 1 is a singular and more than 1 is plural. To put it easy you add -s to the end of a singular form to create the plural. However, it is not always that easy, as there are several exceptions.

In this post I would like to present this simple grammar in a mind map, two mnemonics and two games.
I hope you will find this post useful.
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Plurals – mind map

The following mind map shows the way a student should think when they try to form a plural. First they have to decide whether the plural is regular or not.
To remember the irregular plural here is a simple and short story to help.

Three men and women have six children. It is a lot of people.

Then the students should decide whether they need to add -es. -es is added if the singular ends with x, s, z or h (this rule is simplified. The singular must not end with -ath, but there are no words at elementary level with this ending.) To remember the letters here is a simple mnemonic:

haz six (do not worry if your students change it to haz sex. In fact, they will remember this much better).

Plurals – mind map

There are two simple games to practise the plurals. Both of them will play on any mobile device you can think of, so you or your students can practice anywhere they go.
The first one is called reaction and you should type the singular form of the noun and then click on the frog as soon as it appears.
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Thank you for your comment. You are completely right. However, this mind map is really only for elementary students and I try to keep it as simple as possible. I hope that my students will master the basics and all the exceptions will be introduced and noticed later.